include/asm-arm/mach/dma.h

   1 /*
   2  *  linux/include/asm-arm/mach/dma.h
   3  *
   4  *  Copyright (C) 1998-2000 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  This header file describes the interface between the generic DMA handler
  11  *  (dma.c) and the architecture-specific DMA backends (dma-*.c)
  12  */
  13
  14 struct dma_struct;
  15 typedef struct dma_struct dma_t;
  16
  17 struct dma_ops {
  18         int     (*request)(dmach_t, dma_t *);           /* optional */
  19         void    (*free)(dmach_t, dma_t *);              /* optional */
  20         void    (*enable)(dmach_t, dma_t *);            /* mandatory */
  21         void    (*disable)(dmach_t, dma_t *);           /* mandatory */
  22         int     (*residue)(dmach_t, dma_t *);           /* optional */
  23         int     (*setspeed)(dmach_t, dma_t *, int);     /* optional */
  24         char    *type;
  25 };
  26
  27 struct dma_struct {
  28         struct scatterlist buf;         /* single DMA                   */
  29         int             sgcount;        /* number of DMA SG             */
  30         struct scatterlist *sg;         /* DMA Scatter-Gather List      */
  31
  32         unsigned int    active:1;       /* Transfer active              */
  33         unsigned int    invalid:1;      /* Address/Count changed        */
  34         unsigned int    using_sg:1;     /* using scatter list?          */
  35         dmamode_t       dma_mode;       /* DMA mode                     */
  36         int             speed;          /* DMA speed                    */
  37
  38         unsigned int    lock;           /* Device is allocated          */
  39         const char      *device_id;     /* Device name                  */
  40
  41         unsigned int    dma_base;       /* Controller base address      */
  42         int             dma_irq;        /* Controller IRQ               */
  43         struct scatterlist cur_sg;      /* Current controller buffer    */
  44         unsigned int    state;
  45
  46         struct dma_ops  *d_ops;
  47 };
  48
  49 /* Prototype: void arch_dma_init(dma)
  50  * Purpose  : Initialise architecture specific DMA
  51  * Params   : dma - pointer to array of DMA structures
  52  */
  53 extern void arch_dma_init(dma_t *dma);
  54
  55 extern void isa_init_dma(dma_t *dma);